From 2ddab3adf8fbec91b177ac7411163057fd4e0758 Mon Sep 17 00:00:00 2001
From: Mark Jaquith <markjaquith@git.wordpress.org>
Date: Thu, 3 Dec 2015 16:34:00 +0000
Subject: [PATCH] Route HEAD API requests through the GET callback method

fixes #34837
props danielbachhuber

git-svn-id: https://develop.svn.wordpress.org/trunk@35758 602fd350-edb4-49c9-b593-d223f7449a82
---
 src/wp-includes/rest-api/class-wp-rest-server.php |  3 ++-
 tests/phpunit/tests/rest-api/rest-server.php      | 10 ++++++++++
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/src/wp-includes/rest-api/class-wp-rest-server.php b/src/wp-includes/rest-api/class-wp-rest-server.php
index 62f7343069..2c46fd8d58 100644
--- a/src/wp-includes/rest-api/class-wp-rest-server.php
+++ b/src/wp-includes/rest-api/class-wp-rest-server.php
@@ -780,7 +780,8 @@ class WP_REST_Server {
 				$callback  = $handler['callback'];
 				$response = null;
 
-				if ( empty( $handler['methods'][ $method ] ) ) {
+				$checked_method = 'HEAD' === $method ? 'GET' : $method;
+				if ( empty( $handler['methods'][ $checked_method ] ) ) {
 					continue;
 				}
 
diff --git a/tests/phpunit/tests/rest-api/rest-server.php b/tests/phpunit/tests/rest-api/rest-server.php
index 248ba56740..c9431f0954 100644
--- a/tests/phpunit/tests/rest-api/rest-server.php
+++ b/tests/phpunit/tests/rest-api/rest-server.php
@@ -121,6 +121,16 @@ class Tests_REST_Server extends WP_Test_REST_TestCase {
 		$this->assertEquals( array( 'foo' => 'bar' ), $request->get_params() );
 	}
 
+	public function test_head_request_handled_by_get() {
+		register_rest_route( 'head-request', '/test', array(
+			'methods'  => array( 'GET' ),
+			'callback' => '__return_true',
+		) );
+		$request = new WP_REST_Request( 'HEAD', '/head-request/test' );
+		$response = $this->server->dispatch( $request );
+		$this->assertEquals( 200, $response->get_status() );
+	}
+
 	/**
 	 * Pass a capability which the user does not have, this should
 	 * result in a 403 error.